Java Reference
In-Depth Information
for
(numTries = 0; numTries
<
=9; numTries++)
{
...
System. out . println (numTries) ;
The code in the block will be executed 10 times. Let us next show an implementation
of our game using the
for
loop.
1
import
java . util .
∗
;
2
3
public class
GuessGame
{
4
public static void
main(String [] args)
{
5
int
number = (
int
)
(Math . random ( )
∗
1000) ;
6
Scanner keyboard =
new
Scanner(System. in) ;
7
for
(
int
numTries = 0; numTries
<
10; numTries++)
{
8
System . out . p r i n t l n (
"Enter your guess: "
);
9
int
guess = keyboard . nextInt () ;
10
if
( guess == number)
{
11
System . out . p r i n t l n (
"You got it!"
);
12
return
;
13
}
14
if
(guess
>
number)
{
15
System . out . p r i n t l n (
"Go lower"
);
16
}
else
{
17
System . out . p r i n t l n (
"Go higher"
);
18
}
19
}
20
System . out . p r i n t l n (
"You ran out of guesses"
);
21
System . out . p r i n t l n (
"My number was: "
+number) ;
22
}
23
}
Line 5 creates a random number between 0 and 999. Lines 7-19 create a
for
loop
that is executed 10 times. If the player enters the correct guess (Line 10), then we print an
appropriate message (Line 11) and terminate the program (Line 12). Otherwise, we compare
the player's guess with the chosen number and tell the player to go higher or lower. Note
that Lines 20-21 will only be executed if the
return
statement on Line 12 is never executed,
that is, the player was unsuccessful in guessing the number in ten tries.
Sometimes, we may want to execute more code after the game ends (e.g., start a different
game). In this case, exiting the program when the user enters the correct guess is not the
right option. An alternative implementation that does not use the
return
statement is
shown next.
1
import
java . util .
∗
;
2
3
public class
GuessGame
{
4
public static void
main(String [] args)
{
5
int
number = (
int
)
(Math . random ( )
1000) ;
∗
6
Scanner keyboard =
new
Scanner(System. in) ;
7
int
numTries ;
8
for
(numTries = 0; numTries
<
10; numTries++)
{
9
System . out . p r i n t l n (
"Enter your guess: "
);
10
int
guess = keyboard . nextInt () ;
11
if
(guess
>
number)
{
12
System . out . p r i n t l n (
"Go lower"
);
13
continue
;
